GridControl ComboBox events change or close up

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hii use GridControl ComboBox to load data from table in data basei want when i change the in ComboBox or close up the comboboxload anthother data from another table and put them in an other col i have tryed but the data on the ComboBox when i filtter not as it shown

I am afraid I am unclear with your query. With my
understandings, I have provided a suggestion.

In the sample provided you have used CurrentCellActivated event which
is unnecessary as the CurrentCellShowedDroppedDown event can be used for
customizing the GridListControl. Please refer the below link for your
reference.

And as I guess your requirement is when the selection changes , load newly
selected value of column1 in dropdownlist to the gridcontrol column1 cell , then use the below code in ModelQueryCellInfo
event instead of CurrentCellChangedEvent.